Off the grid we use the propane furnace as the only source of heat since the trailer ducting provides some pretty good distribution of the heat. Beware this uses lots of propane, so we've not done this for very long (2-3 days max). We use generators to recharge the batteries.
DW would love additional heat and we have dual Honda generators (4000w) to plug in the rig and to use for a portable 110/120v heater/fan that moves throughout the trailer to concentrate additional heat. It's not that good, and we need something better, but if it's that cold we have the option of returning home.
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